Stereoselective Spirolactam Synthesis via Palladium Catalyzed Arylative Allene Carbocyclization Cascades
摘要:
A diastereoselective arylative carbocyclization of pro-nucleophile-linked allenes with aryl and heteroaryl halides to provide spirocyclic lactam products with moderate to high diastereoselectivities and good yields under Pd(0) catalysis is reported. Being operationally simple and tolerant of multiple points of diversity, this complexity building reaction cascade, in which two new carbon-carbon bonds and one new heterocyclic ring are created, should be of high value in both complex natural product synthesis as well as compound library synthesis.
Palladium-catalyzed carboxylative cyclization of α-allenyl amines in dense carbon dioxide
作者:Yoshihito Kayaki、Naoko Mori、Takao Ikariya
DOI:10.1016/j.tetlet.2009.09.015
日期:2009.11
Carboxylative transformation of 2,3-allenic amines into 5-vinyl-1,3-oxazolidin-2-ones was promoted by palladium catalysts under a pressurized CO2 condition. The presence of a stereogenic center adjacent to the allene group resulted in the formation of the corresponding cyclic urethane as a single trans-diastereomer.