Synthesis and Reactions of Some New 1,3-Dioxa-2-bora Heterocycles Derived from<i>o</i>-Hydroxybenzyl Alcohol
作者:G. Srivastava、P. N. Bhardwaj
DOI:10.1246/bcsj.51.524
日期:1978.2
2-alkoxy-1,3,2-benzodioxaborole>2-phenoxy-4H-1,3,2-benzodioxaborin>(I)>2-alkoxy-1,3,2-dioxaborinane. Codisproportionation reaction between bis(4H-1,3,2-benzodioxaborin-2-yl)oxide (obtained directly from boric acid and o-hydroxybenzyl alcohol) and triorganotin hydroxide or oxide yields 2-triorganostannoxy-4H-1,3,2-benzo-dioxyborin. Cleavage and insertion reactions of these compounds have been studied.
2-Isopropoxy-4H-1,3,2-benzodioxaborin(I),从异丙基硼酸酯和邻羟基苯甲醇中获得,与多种羟基化合物(即叔丁醇、苯酚、乙烷-1,2 -二醇、2-氨基乙醇、邻氨基苯酚)和乙酸酐,得到相应的 2-取代杂环。(I) 以及其他 1,3-dioxa-2-bora 杂环与碱(即氨、三乙胺、吡啶、二甲基甲酰胺)的反应表明硼的亲电性按以下顺序降低:2-烷氧基-1、 3,2-苯并二氧杂硼烷>2-苯氧基-4H-1,3,2-苯并二氧杂硼烷>(I)>2-烷氧基-1,3,2-二氧杂硼烷。双(4H-1,3,2-苯并二氧杂硼烷-2-基)氧化物(直接从硼酸和邻羟基苯甲醇中获得)和三有机锡氢氧化物或氧化物之间的共歧化反应产生2-三有机锡氧基-4H-1,3,2-苯二氧硼。