Controlling factors on the stereochemistry of palladium(II)-catalyzed cyclization of 1'-alkyl-4'-chloro-2'-alkenyl 2-alkynoates
摘要:
Beta,gamma-Disubstituted alpha-(Z)-(chloromethylene)-gamma-butyrolactone derivatives have been prepared highly diastereoselectively via a Pd(II)-catalyzed cyclization of 1'-alkyl-4'-chloro-2'-alkenyl 2-alkynoates. Rationales for the stereochemical results of this reaction are proposed.
Controlling factors on the stereochemistry of palladium(II)-catalyzed cyclization of 1'-alkyl-4'-chloro-2'-alkenyl 2-alkynoates
摘要:
Beta,gamma-Disubstituted alpha-(Z)-(chloromethylene)-gamma-butyrolactone derivatives have been prepared highly diastereoselectively via a Pd(II)-catalyzed cyclization of 1'-alkyl-4'-chloro-2'-alkenyl 2-alkynoates. Rationales for the stereochemical results of this reaction are proposed.
A palldium(0)-catalyzed tandem cyclization/Suzuki coupling reaction of various 1,6-enyne substrates was developed. This Pd-catalyzed enyne cyclization reaction represents a new process for the synthesis of stereodefined α-arylmethylene-γ-butyrolactones, lactams, multifunctional tetrahydrofurans, pyrrolidines, and cyclopentanes. The mechanism of the reaction was studied by the employment of different