作者:Rolf Gericke、Juergen Harting、Inge Lues、Christine Schittenhelm
DOI:10.1021/jm00114a017
日期:1991.10
were obtained which gave 3-alkylchromenes following reduction and dehydration. Subsequent 3-chloroperbenzoic acid oxidation produced the versatile epoxide intermediates 15, from which 3,4-epoxy-3,4-dihydro-2,2,3-trimethyl-2H-1-benzopyran-6-carbonitrile (15a) was resolved into its enantiomers by entrainment. In addition to the methyl group, the benzyl, alkyloxymethyl, and 2-nitroethyl residues could
通过4-苯并二氢吡喃酮与多聚甲醛的醛醇缩合反应,得到3-亚烷基并苯并二氢吡喃酮10,其在还原和脱水后得到3-烷基并苯并二氢吡喃酮。随后的3-氯过苯甲酸氧化生成了通用的环氧中间体15,从中将3,4-环氧-3,4-二氢-2,2,3-三甲基-2H-1-苯并吡喃-6-腈(15a)分解为它的对映体通过夹带。除甲基外,还可在3-位引入苄基,烷氧基甲基和2-硝基乙基残基。用2-吡啶酮同时处理15a,得到N-和O-取代的产物19a和20。通过用碱处理,19a容易得到4-(1,2-二氢-2-氧代-1-吡啶基)苯二甲基21。相应的吡咯烷酮化合物26和27通过略微修改的程序获得。与2,4-二羟基吡啶或3反应 6-哒嗪二醇导致4-(杂环基氧基)苯并二氢吡喃酚的排他性形成(31和32)。用3-氨基-6-哒嗪醇处理15a,得到没有NH桥的4-(3-氨基-1,6-二氢-6-氧代-1-吡啶嗪基)苯并二氢吡喃醇衍生物34。这可以在环氮原子(----