Yield:32047-53-3 31.6 g

Reaction Conditions:

with hydrogenchloride in water at 115; for 40 h;

Steps:

3
Directly add 10 molar equivalents of concentrated hydrochloric acid to the above 5,5-dimethyl-2-(2-pyridyl)thiazolidine mother liquor, warm to 115°C for 40 hours, and distill the low-boiling matter at atmospheric pressure while reacting. After dehydration, the crude product was crystallized to obtain 31.6 g of dimethylcysteamine hydrochloride, and its content was still as high as 98.0% after testing.

References:

Hengyang Fenglian Fine Chemical Co., Ltd.;Xiao Yuanchun CN110981828, 2020, A Location in patent:Paragraph 0034; 0036

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