The synthesis of 13-hydroxylated ent-kaur-16-ene derivatives using an acyloin-like cyclization of keto esters
作者:I.F. Cook、J.R. Knox
DOI:10.1016/0040-4020(76)80050-6
日期:1976.1
The synthesis of steviol (27) and two A-ring modified analogues (9 and 15) is described. The synthetic sequences involve the preparation of suitably constituted 17-nor-13,16-seco-ent-kauranoid keto esters (22, 7 and 13) which are then cyclized to 13,16-dooxygenated-17-nor-ent-kauranes (23, 8 and 14).
描述了甜菊醇(27)和两个A环修饰的类似物(9和15)的合成。该合成序列涉及适当地制备构成17去甲13,16-seco- ENT -kauranoid酮酯(22,7和13),其然后环化成13,16-dooxygenated -17-去甲ENT -kauranes(23、8和14)。