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Syn-2,3-Disubstituted-2,3-dihydro-1,4-benzoxathiin Rings: Preparation from Quinone Ketals and 2-Mercaptoethanols.

✍ Scribed by Peter G. Dormer; et al. et al.

Book ID
111699575
Publisher
John Wiley and Sons
Year
2004
Weight
28 KB
Volume
35
Category
Article
ISSN
0931-7597

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## Abstract The ureas **3** which are obtained from 3‐(benzylamino)propanenitrile (**1**) and various isocyanates (**2**) cyclize readily upon heating in ethanol, in the presence of hydrochloric acid, to form 3‐substituted 1‐benzyldihydro‐2,4‐(1__H__,3__H__)pyrimidinediones (**11**) in good yield.