Sibi, Mukund P.; Jasperse, Craig P.; Ji, Jianguo, Journal of the American Chemical Society, 1995, vol. 117, # 43, p. 10779 - 10780
作者:Sibi, Mukund P.、Jasperse, Craig P.、Ji, Jianguo
DOI:——
日期:——
Free Radical-Mediated Intermolecular Conjugate Additions. Effect of the Lewis Acid, Chiral Auxiliary, and Additives on Diastereoselectivity
作者:Mukund P. Sibi、Jianguo Ji、Justin B. Sausker、Craig P. Jasperse
DOI:10.1021/ja991205e
日期:1999.8.1
We have developed a highly diastereoselective method for the conjugate addition of carbon radicals to chiral α,β-unsaturated N-enoyloxazolidinones using Bu3SnH as chain carrier and Et3B/O2 as radical initiator. Lewis acids have been screened, and Yb(OTf)3 proved to give optimized results for both chemical yield (88% for 1a and 94% for 1b) and diastereoselectivity (25:1 for 1a and 46:1 for 1b). The