申请人:Akzona Incorporated
公开号:US04222940A1
公开(公告)日:1980-09-16
There are disclosed substrates of the formula: ##STR1## wherein: (a) R.sub.1 is H or C.sub.1 -C.sub.4 alkyl; (b) R.sub.2 is H or C.sub.1 -C.sub.4 alkyl with the proviso that R.sub.1 is H when R.sub.2 is alkyl, and with the proviso that R.sub.2 is H when R.sub.1 is alkyl; (c) R.sub.3 is a leaving group including hydroxy, C.sub.1 -C.sub.4 alkoxy, C.sub.2 -C.sub.4 alkoxalkoxy, C.sub.1 -C.sub.7 acyloxy, and trialkylsilyloxy of less than fifteen carbons; and (d) R.sub.5(1) and R.sub.5(2) are each H, C.sub.1 -C.sub.8 alkyl, or an optionally esterified or etherified hydroxy group including hydroxy, C.sub.1 -C.sub.4 alkoxy, C.sub.2 -C.sub.4 alkoxyalkoxy, C.sub.1 -C.sub.15 trialkylsilyloxy, C.sub.4 -C.sub.8 cycloalkoxy, C.sub.1 -C.sub.7 carboxyacyloxy, or unsubstituted heterocyclic ether of five to seven members, with the proviso that at least one of R.sub.5(1) and R.sub.5(2) is hydrogen. A method is disclosed for the cyclization of the compounds of formula I leading to compounds of the following formulae: ##STR2## having R.sub.4 as defined above, with R.sub.5 being R.sub.5(1) or R.sub.5(2) as defined above, and R.sub.7 being C.sub.1 -C.sub.4 alkyl.
揭示了以下公式的底物:##STR1## 其中:(a) R.sub.1为H或C.sub.1 -C.sub.4烷基;(b) R.sub.2为H或C.sub.1 -C.sub.4烷基,条件是当R.sub.2为烷基时R.sub.1为H,且条件是当R.sub.1为烷基时R.sub.2为H;(c) R.sub.3是包括羟基、C.sub.1 -C.sub.4烷氧基、C.sub.2 -C.sub.4烷氧基烷氧基、C.sub.1 -C.sub.7酰氧基和少于十五个碳的三烷基硅氧基的脱离基;和(d) R.sub.5(1)和R.sub.5(2)分别为H、C.sub.1 -C.sub.8烷基,或者一个可选择酯化或醚化的羟基,包括羟基、C.sub.1 -C.sub.4烷氧基、C.sub.2 -C.sub.4烷氧基烷氧基、C.sub.1 -C.sub.15三烷基硅氧基、C.sub.4 -C.sub.8环烷氧基、C.sub.1 -C.sub.7羧酰氧基,或五到七个成员的未取代杂环醚,条件是R.sub.5(1)和R.sub.5(2)中至少有一个为氢。公开了一种用于使公式I化合物环化的方法,从而得到以下公式的化合物:##STR2## 其中R.sub.4如上定义,R.sub.5为上述定义的R.sub.5(1)或R.sub.5(2),R.sub.7为C.sub.1 -C.sub.4烷基。