作者:Karen Goodall、Andrew F. Parsons
DOI:10.1016/s0040-4039(96)02352-0
日期:1997.1
The 5-endo radical cyclisation of pyruvic acid derived dehydroalanines which contain chiral ester auxiliaries is reported. Cyclisation of the menthol ester derivative using Bu3SnH at 80°C proceeded with low diastereoselectivity (1.75:1) but the selectivity could be increased to 6:1 on cyclisation of the corresponding 8-phenylmenthyl ester at 20°C.
据报道含有手性酯助剂的丙酮酸衍生的脱氢丙氨酸的5-内酯基环化。使用Bu 3 SnH在80°C下进行薄荷醇酯衍生物的环化反应时,非对映选择性较低(1.75:1),但在20°C下将相应的8-苯基薄荷基酯环化后,选择性可以提高至6:1。