Toluene → HCID 12040974, compound

Participants

Reaction Steps

[R-(R*,S*)]-β-(Benzoylamino)-α-hydroxybenzenepropanoic acid, ethyl ester (2.200 mg) was suspended in toluene (250 ml) and the flask equipped with a Dean-Stark trap. After heating to reflux, the compound dissolved. 40 ml of toluene were distilled off, PPTS (120 mg) and 2-methoxypropene (3.5 ml) were added, and distillation was continued. Further additions of 2-methoxypropene (2 ml, and then 1 ml) and toluene (50 ml, and then another 50 ml) were made, and the distillate periodically discarded. Purification on HPLC (hexane/ethyl acetate, 3:1) gave 2.3 g (93%) of the title product in a mixture with other reaction products. (Product characteristics consistent with structure of Example 1.)

Provenance & Evidence