反应详情

0.7 g. (2.23 mmoles) of 1-Hydroxy-3-n-pentyl-6,6,9-trimethyl-10a,6a,7,8 -tetrahydrodibenzo[b,d]pyran, 0.48 g. (2.28 mmoles) of γ-morpholinobutyric acid hydrochloride (Cruickshank and Sheehan, J. Am. Chem. Soc. 83, 2891 (1961), m.p. 180°-182°), and 0.48 g. (2.35 mmoles) of dicyclohexylcarbodiimide (Aldrich) were combined with 35 ml. of methylene chloride and stirred at room temperature for a total of 40 hours. The insoluble by-product of dicyclohexylurea was separated by filtration and the methylene chloride was removed using a rotary evaporator. The resulting residue was dissolved in about 20 ml. of benzene and a small amount of insoluble material was removed by filtration. The benzene was evaporated and the residue dried in vacuo to give 0.7 g. of fluffy, white material. Crystallization from benzene/pet ether gave 0.4 g. of product as colorless crystals, m.p. 99°-101°. The material was pure by thin layer chromatography (10% MeOH/CHCl3); the infrared and nmr spectra are in agreement with the proposed structure.

1. customThe insoluble by-product of dicyclohexylurea was separated by filtration
2. customthe methylene chloride was removed
3. customa rotary evaporator
4. dissolutionThe resulting residue was dissolved in about 20 ml
5. customof benzene and a small amount of insoluble material was removed by filtration
6. customThe benzene was evaporated
7. customthe residue dried in vacuo
8. customto give 0.7 g
9. customCrystallization from benzene/pet ether
10. customgave 0.4 g