Catalytic reactions involving alkenes
The present invention relates to new compositions and reactions to produce allylic alcohols or precursors of allylic alcohols (e.g., silyl ethers of allylic alcohols). Methods of the invention may comprise combining an alkene and an aldehyde in the presence of a transition metal catalyst (e.g., a nickel catalyst) to form an allylic alcohol or precursor of an allylic alcohol. Reaction products of the present invention may be valuable as intermediates and/or products in pharmaceutical and polymer research. Also, methods of the invention may be useful as fragment coupling reactions in complex molecule synthesis. Moreover, methods of the invention may include the use of reagents which, under reaction conditions known in the art, may have been unreactive, i.e., may not have been able to form the reaction product. The reagents used in the present invention may be relatively lower in cost than in other methods. Also, methods of the invention may reduce the number of synthetic and purification steps required to produce the reaction products, as well as reducing time, cost, and waste production.
1. A method, comprising:
reacting an alkene and an aldehyde to form an allylic alcohol or precursor of an allylic alcohol, provided that the aldehyde is not formaldehyde,
wherein the alkene has the structure
and any of R 1 , R 4 , R 5 , and R 6 can be the same or different from any other, and each can be independently hydrogen, optionally substituted alkyl, optionally substituted cycloalkyl, optionally substituted aralkyl, optionally substituted heteroaralkyl, optionally substituted alkenylalkyl, or optionally substituted alkynylalkyl; and
wherein the aldehyde has the structure
and R 2 can be optionally substituted alkyl, optionally substituted cycloalkyl, optionally substituted aryl, optionally substituted heteroaryl, optionally substituted aralkyl, optionally substituted heteroaralkyl, optionally substituted alkenylalkyl, or optionally substituted alkynylalkyl.
2. A method, comprising:
reacting an alkene and an aldehyde to form an allylic alcohol or precursor of an allylic alcohol, provided that the alkene is not an electron deficient alkene,
wherein the alkene has the structure
and any of R 1 , R 4 , R 5 , and R 6 can be the same or different from any other, and each can be independently hydrogen, optionally substituted alkyl, optionally substituted cycloalkyl, optionally substituted aralkyl, optionally substituted heteroaralkyl, optionally substituted alkenylalkyl, or optionally substituted alkynylalkyl; and
wherein the aldehyde has the structure
and R 2 can be optionally substituted alkyl, optionally substituted cycloalkyl, optionally substituted aryl, optionally substituted heteroaryl, optionally substituted aralkyl, optionally substituted heteroaralkyl, optionally substituted alkenylalkyl, or optionally substituted alkynylalkyl.
3. A method, comprising:
reacting an alkene and an aldehyde in the presence of a catalyst to form an allylic alcohol or precursor of an allylic alcohol,
wherein the catalyst is a compound comprising a Group 9, Group 10, or Group 11 metal;
wherein the alkene has the structure
and any of R 1 , R 4 , R 5 , and R 6 can be the same or different from any other, and each can be independently hydrogen, optionally substituted alkyl, optionally substituted cycloalkyl, optionally substituted aralkyl, optionally substituted heteroaralkyl, optionally substituted alkenylalkyl, or optionally substituted alkynylalkyl; and
wherein the aldehyde has the structure
and R 2 can be optionally substituted alkyl, optionally substituted cycloalkyl, optionally substituted aryl, optionally substituted heteroaryl, optionally substituted aralkyl, optionally substituted heteroaralkyl, optionally substituted alkenylalkyl, or optionally substituted alkynylalkyl.
4. The method of claim 1 , wherein the alkene is an alpha-olefin.
5. The method of claim 1 , wherein the alkene is not positioned adjacent to an electron-deficient functionality.
6. The method of claim 1 , further comprising a catalyst.
7. The method of claim 6 , wherein the catalyst comprises a Group 9, Group 10, or Group 11 metal.
8. The method of claim 2 , wherein the alkene is an alpha-olefin.
9. The method of claim 2 , further comprising a catalyst.
10. The method of claim 9 , wherein the catalyst comprises a Group 9, Group 10, or Group 11 metal.
11. The method of claim 3 , wherein the alkene is an alpha-olefin.
12. The method of claim 3 , wherein the alkene is not positioned adjacent to an electron-deficient functionality.
13. The method of claim 3 , wherein the catalyst comprises cobalt, rhodium, iridium, nickel, palladium, platinum, copper, silver, or gold.
14. The method of claim 3 , further comprising a phosphine.