conditions with various nucleophiles led to a series of chiral-bridged azepanes with configuration at C-4 dependent on the configuration of the starting alcohol. High yielding, stereoselective ring expansion to novel 2-azabicyclo[3.2.1]octane system occurred via aziridinium intermediates, which were specifically opened by nucleophilic attack at the more substituted carbon.
2-三氮杂
硼烷-3-基
甲醇在光延或甲磺酰化条件下与各种亲核试剂的反应导致一系列手性桥连的氮杂
环庚烷,其C-4的构型取决于起始醇的构型。通过
叠氮基中间体发生了高产立体选择性环扩环至新型2-氮杂
双环[3.2.1]辛烷系统,这些中间体是通过亲核性攻击在取代度更高的碳上特异性打开的。