Synthesis of all four enantiomers of 1-aminoindane-2-carboxylic acid, a new cispentacin benzologue
作者:Ferenc Fülöp、Márta Palkó、Judit Kámán、László Lázár、Reijo Sillanpää
DOI:10.1016/s0957-4166(00)00375-x
日期:2000.10
Racemic cis- and trans-1-aminoindane-2-carboxylic acids (3 and 5) were prepared from indene by chlorosulphonyl isocyanate addition followed by ring opening and isomerisation. The intermediate racemic hydroxymethylated β-lactam 6 was resolved through the lipase-catalysed asymmetric acylation of the primary hydroxy group at the (R)-stereogenic centre. High enantioselectivities (E>200) were observed when
外消旋的顺式和反式-1-氨基茚满-2-羧酸(3和5)是由茚通过加氯磺酰基异氰酸酯加成,然后开环和异构化而制备的。中间消旋的羟甲基化的β-内酰胺6是通过脂肪酶催化的(R)-立体异构中心的伯羟基的不对称酰化反应而拆分的。当使用脂肪酶AK或脂肪酶PS作为催化剂和乙酸乙烯酯或丁酸乙烯酯作为酰基供体进行酶促反应时,观察到高对映选择性(E > 200)。水解和异构化,导致在所有四个对映异构体(9,11,13和14)1-氨基茚满-2-羧酸,一种新的顺式戊二酸苯并酯。