Farnesyl chain modification of squalene synthase inhibitor benzylfarnesylamine: Conversion to the terminal bis(trifluoromethyl) derivative
作者:Charles F Jewell、John Brinkman、Russell C Petter、James R Wareing
DOI:10.1016/s0040-4020(01)89661-7
日期:1994.3
Potent squalene synthase inhibitor 1 was converted to the bis(trifluoromethyl) analog 14 in 11% overall yield for 9 steps. The amine nitrogen of 1 was protected with the 2-(trimethylsilyl)ethoxycarbonyl (TEOC) protecting group. The 10,11 olefin was selectively epoxidized, cleaved and converted to the phosphonium salt 6. The ylid from 6 underwent a Wittig condensation with hexafluoroacetone to give
将强力角鲨烯合酶抑制剂1以11%的总收率转化为双(三氟甲基)类似物14,历时9个步骤。的胺氮1是用2-(三甲基硅烷基)乙氧基羰基(TEOC)保护基团保护。将10,11烯烃选择性地环氧化,裂解并转化为the盐6。将来自6的类化合物与六氟丙酮进行Wittig缩合反应,得到含TEOC的烯烃8。如果不将法呢基链的10,11烯烃异构化为E-9,10烯烃,则四丁基氟化铵或HF不能除去TEOC基团。的双(三氟甲基)烯烃8对酸性或碱性条件非常敏感。然而,发现BF 3 ·Et 2 O可以除去TEOC基团而没有不希望的异构化得到14。