Diastereoselective Synthesis of Enantiopure Morpholines by Electrophilic Selenium-Induced 6-<i>e</i><i>xo </i>Cyclizations on Chiral 3-Allyl-2-hydroxymethylperhydro-1,3-benzoxazine Derivatives
作者:Rafael Pedrosa、Celia Andrés、Pilar Mendiguchía、Javier Nieto
DOI:10.1021/jo061547k
日期:2006.11.1
chiral 3-allyl-2-hydroxymethyl-substituted perhydro-1,3-benzoxazine derivatives. The cyclization occurs in high yields and diastereoselection, although the temperature of the reaction and the structure of the substituent at C-2 and the substitution pattern of the double bond can modify the regio- and stereochemistry of the final products.
对映体纯的吗啉衍生物是通过手性3-烯丙基-2-羟甲基取代的过氢-1,3-苯并恶嗪衍生物的硒环官能化制备的。尽管反应温度和C-2处取代基的结构以及双键的取代方式可以改变最终产物的区域和立体化学,但环化反应仍以高收率和非对映异构发生。