Versatile synthesis of sulphamate esters by phase-transfer methods

The syntheses of sulphamate esters of the general types R¹R ²NSO₃R³, RNHSO₃R³, and H₂NSO₃R³, where R³ may be aliphatic or aromatic, have been achieved in good yield by reaction of the appropriate sulphamoyl chlorides with alcohols and phenols under mild phase-transfer conditions. The present methods have led to generally higher yields, and to shorter reaction times and lower reaction temperatures than were hitherto found necessary. The prior preparation of the alkoxide has also been obviated. Some esters have been rearranged to the isomeric betaines.