作者:Jörg Pietruszka、Andreas Witt、Wolfgang Frey
DOI:10.1002/ejoc.200300220
日期:2003.8
The “Garner” aldehyde has been used as a common intermediate for the preparation of the corresponding alkyne 7 and the alkenylboronic esters 12−16 (24−80%). Diastereoselective cyclopropanation afforded cyclopropylboronic esters 17−20 (60−84%, dr 22:78 to 92:8), the configurations of which were determined by chemical correlation (cyclopropanols 22), X-ray structural analysis (of 21a), and characteristic
“加纳”醛已被用作制备相应炔烃 7 和烯基硼酸酯 12-16 (24-80%) 的常用中间体。非对映选择性环丙烷化得到环丙基硼酸酯 17-20(60-84%,dr 22:78 至 92:8),其构型由化学相关性(环丙醇 22)、X 射线结构分析(21a)和特征确定核磁共振光谱数据。受保护的氨基醇 23-26 和氨基酸 27 是由环丙基硼酸酯 19 通过氧化、Matteson 同源性或 Suzuki 偶联合成的。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2003)