In organic chemistry, atoms other than carbon and hydrogen are generally referred to as heteroatoms. The most common heteroatoms are nitrogen, oxygen and sulfur. Now I present to you an article called Preparation of chlorinated 3-indolylacetic acids, published in 1977, which mentions a compound: 63352-97-6, mainly applied to indoleacetic acid chloro; phenylhydrazine cyclization formylpropionate; hydrazine phenyl reaction formylpropionate; propionate formyl reaction phenylhydrazine, SDS of cas: 63352-97-6.
Indoleacetic acids I (Rn = 4-Cl, 6-Cl) were prepared in 38-40% yield by reaction of the resp. chloro(diethylaminomethyl)indole with NaCN followed by hydrolysis. I (Rn = 5-Cl, 7-Cl, 4,6-Cl2, 4,7-Cl2, 5,7-Cl2, 6,7-Cl2, 5-Cl-7-Me, 7-Br) were prepared in 7-28% yield by reaction of HCOCH2CH2CO2H with the appropriate phenylhydrazine hydrochlorides.
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Reference:
Thiazolidine – Wikipedia,
Thiazolidine – ScienceDirect.com