Short and Efficient Diastereoselective Synthesis of Enantiopure 1-Substituted 1H-2-Benzopyrans
作者:Rafael Pedrosa、Sonia Sayalero、Martina Vicente
DOI:10.1002/ejoc.200600585
日期:2006.11
different organometallics to 3 yielded alcohols 4 in excellent yields. Hydrolysis of carbinols, with 2 % HCl in methanol or ethanol, allowed for the synthesis of 1,3-disubstituted isochromanes, but hydrolysis in toluene led to enantiopure 1-substituted isochromenes. (© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2006)
高苯甲醛与 (–)-8-(苄氨基)薄荷醇的反应具有区域选择性和非对映选择性,导致手性全氢-1,3-苯并恶嗪 3 为单一非对映异构体。将不同的有机金属化合物添加到 3 中以极好的收率产生醇 4。用甲醇或乙醇中的 2% HCl 水解甲醇,可以合成 1,3-二取代异色烷,但在甲苯中水解产生对映纯的 1-取代异色烯。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2006)