Synthesis of (+)-7a-epi-7-deoxycasuarine via cross metathesis
作者:David Koch、Simon Maechling、Siegfried Blechert
DOI:10.1016/j.tet.2007.05.007
日期:2007.7
Olefin crossmetathesis of vinyl pyrrolidine derivatives has been explored, culminating in a concise synthesis of (+)-7a-epi-7-deoxycasuarine in nine steps, from commercially available starting materials.
An efficient synthesis of the side chain intermediate of BO-2502A, a new 1β-methyl carbapenem, via diastereoselective lactamization as a key step
作者:Norikazu Ohtake、Yasuyuki Imai、Ryosuke Ushijima
DOI:10.1016/s0040-4020(98)00007-6
日期:1998.3
The BO-2502A side chain intermediate 3 was prepared via the diastereoselective lactamization of the in situ prepared amino diacid anhydride 14 as a key step. The diastereoselectivity of this step was found to be 53:1 (96% de). (C) 1998 Elsevier Science Ltd. All rights reserved.