反应详情

A suspension of 4.7 g of 5-amino-6-fluoro-3-(2-propynyl)-2-benzothiazolinone, 1.93 g of diketene and 0.05 g of 4-pyrrolidinopyridine in 250 ml of benzene is stirred at room temperature for 30 minutes and subsequently held at 50° C. for 30 minutes. In this manner there is obtained a solution of 5-acetoacetylamino-6-fluoro-3-(2-propynyl)-2-benzothiazolinone which is used as such in the next reaction step without isolation of the product.

1. waitsubsequently held at 50° C. for 30 minutes