HRID1732524

反应详情

EQUATION

反应方程式

HRID 1732524 的结构方程式

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

  1. washThe trifluoroacetate salt washed with ether
  2. customdried
  3. customNext day the product was isolated
  4. custompurified by precipitation from a solution in DMF with H2O
  5. washThe product was washed with H2O
  6. customdried