An Efficient Protocol for the Palladium-Catalyzed Asymmetric Decarboxylative Allylic Alkylation Using Low Palladium Concentrations and a Palladium(II) Precatalyst
作者:Alexander N. Marziale、Douglas C. Duquette、Robert A. Craig、Kelly E. Kim、Marc Liniger、Yoshitaka Numajiri、Brian M. Stoltz
DOI:10.1002/adsc.201500253
日期:2015.7.6
catalytic allylic alkylation for the synthesis of 2‐alkyl‐2‐allylcycloalkanones and 3,3‐disubstituted pyrrolidinones, piperidinones and piperazinones has been previously reported by our laboratory. The efficient construction of chiral all‐carbon quaternary centers by allylic alkylation was previously achieved with a catalyst derived in situ from zero‐valent palladium sources and chiral phosphinooxazoline
ASYMMETRIC CATALYTIC DECARBOXYLATIVE ALKYL ALKYLATION USING LOW CATALYST CONCENTRATIONS AND A ROBUST PRECATALYST
申请人:Stoltz Brian M.
公开号:US20160280623A1
公开(公告)日:2016-09-29
This invention provides efficient and scalable enantioselective methods that yield 2-alkyl-2-allylcycloalkyanone compounds with quaternary stereogenic centers. Methods include the method for the preparation of a compound of formula (I):
comprising treating a compound of formula (II) or (III):
with a palladium (II) catalyst under alkylation conditions.
A compound useful as a building block for the manufacture of various compounds is represented by Formula A or D.
In Formula A and D, z is 0 or 1; Q is a heteroatom; R1 through R11 and Ra through Rf are each independently hydrogen, a substituted or unsubstituted hydrocarbyl group, a substituted or unsubstituted heteroatom containing hydrocarbyl group, or a functional group; d, e and f are each independently 0 or greater; each of A, B and D is independently a carbon atom or a heteroatom; and two or more of R1 though R11, Ra through Rf and Y optionally combine to form a ring. In some embodiments, R8 and R9 combine to form a carbonyl group. In some embodiments, R2 and Y combine to form a ring with the Q atom. In some embodiments, the ring includes at least one double bond.
The invention provides heterocyclic compounds with quaternary centers and methods of preparing compounds. Methods include the method for the preparation of a compound of Formula (II):
comprising treating a compound of Formula (I):
with a transition metal catalyst and under alkylation conditions as valence and stability permit.