On the Mechanism of Dehydration of a β-Hydroxycyclopentanone Analogue of Prostaglandin E1
作者:Hyuk-Koo Lee、Howard J. Lambert、Richard L. Schowen
DOI:10.1002/jps.2600730306
日期:1984.3
The dehydration of the beta-hydroxycyclopentanone, 11,16-dihydroxy-16-methyl-9-oxo-13-trans-protenoic acid methyl ester, an analogue of prostaglandin E1, proceeds with acid catalysis (pH less than 3), by uncatalyzed routes (pH congruent to 4 and congruent to 7), and with base catalysis (pH congruent to 5-6 and greater than 8). Deuterium from the solvent is not introduced alpha to the reactant keto
β-羟基环戊酮,11,16-二羟基-16-甲基-9-氧代-13-反戊烯酸甲酯(一种前列腺素E1的类似物)的脱水通过未催化而进行酸催化(pH小于3)。路线(pH等于4且等于7),并具有碱催化作用(pH等于5-6且大于8)。pH等于1时,溶剂中的氘在60%反应时不会引入α到反应物的酮官能团中,但在pH等于5时发生了约30%的交换,在pH等于7时发生了50%的交换,而在pH等于80%时发生了交换。数据与9至9的数据是一致的。在该机理中,首先用酸,碱和水将底物催化催化烯醇化为1,3-烯二醇,然后通过酸,碱和水的催化使水松弛。第一步是在强酸溶液中测定速率