Reaction of N-haloamide. XXVIII. Preparation of N,N-dibromourethan and reactions of N,N-dihaloamides with styrene and 1,2-dihydronaphthalenes.
作者:HIROMI TERAUCHI、KEIKO KOWATA、TOSHIE MINEMATSU、SHOJI TAKEMURA
DOI:10.1248/cpb.25.556
日期:——
N, N-Dibromourethan (DBU) was prepared. The addition of DBU to styrene gave an anti-Markownikoff's adduct, (2). The orientation of the addition of DBU is thus similar to that of N, N-dichloro analogue (DCU) and opposed to that of N, N-dibromobenzenesulfonamide (DBBS). Reactions of DBU, DCU, and DBBS or N, N-dibromo-p-toluenesulfonamide with 1, 2-dihydronaphthalene were examined in which DBBS gave desired adduct, (5), in good yield whereas DCU and DBU gave no normal adduct but complex mixtures. Reaction of methyldihydronaphthalenes with these reagents gave similar results. Compound (2) was converted to 1-bromo-2-benzenesulfonamido (7), and 1-alkoxy-2-benzenesulfonamido-1, 2, 3, 4-tetrahydronaphthalenes (8 and 9).
N,N-二溴氨基乙酸酯(DBU)已被制备。将DBU加入苯乙烯中获得了反马尔科夫尼科夫加成产物(2)。因此,DBU的加成取向与其N,N-二氯同类物(DCU)相似,而与N,N-二溴苯磺酰胺(DBBS)的取向相反。对DBU、DCU和DBBS或N,N-二溴对苯磺酰胺与1,2-二氢萘的反应进行了研究,其中DBBS获得了良好产率的所需加成产物(5),而DCU和DBU则没有生成正常的加成产物,反而得到了复杂的混合物。甲基二氢萘与这些试剂的反应也得到了类似的结果。化合物(2)被转化为1-溴-2-苯磺酰胺(7)和1-烷氧基-2-苯磺酰胺-1,2,3,4-四氢萘(8和9)。