Molecular Diversity of Tonghaosu: Synthesis of Lactam-Containing Tonghaosu Analogs
作者:Yu-Lin Wu、Biao-Lin Yin、Zheng-Min Yang、Tai-Shan Hu
DOI:10.1055/s-2003-41042
日期:——
A new type of tonghaosu analogs containing spiroketal and lactam functionality was synthesized from methyl 2-furoate and amino alcohols. The stereoselective control of spiroketal chirality was also explored.
Diastereoselective syntheses of [4.4]- and [4.5]-spiroketal featured tonghaosu analogs were explored. An excellent diastereoselectivity was achieved for [4.5]-spiroketals due to anomeric, steric, and perhaps Ï-Ï interactions; [4.4]-spiroketal could be obtained in good diastereoselectivity by tuning substituted pattern of the tetrahydrofuran ring.