HRID1732524
反应详情
EQUATION
反应方程式
REACTANTS
反应物
PRODUCTS
生成物
PROCEDURE
实验过程
The Boc group was removed from a sample of compound XXII (2.5 g, 3.3 mmole) as described in previous paragraphs. The trifluoroacetate salt washed with ether and dried; the white solid (RfC, 0.76) showed on tlc a slight impurity at the origin (presumably the t-butylsulfonium salt). This material was acylated with Boc-L-Gln-ONp (1.4 g, 3.8 mmole, Bachem) in the presence of DIEA (1.3 ml, 8 mmole) and HOBt (0.58 ml, 3.8 mmole). Next day the product was isolated as described for XII and then purified by precipitation from a solution in DMF with H2O. The product was washed with H2O and dried: 28 g (93%), m.p. 238°-241° C. [α]D23 -27.7° (c 0.8, DMF); RfK, 0.43; RfL, 0.50.
WORKUP
后处理
- washThe trifluoroacetate salt washed with ether
- customdried
- customNext day the product was isolated
- custompurified by precipitation from a solution in DMF with H2O
- washThe product was washed with H2O
- customdried