Researchers who often do experiments know that organic synthesis is a process of preparing more complex target molecules from simple raw materials through one or more chemical reactions. Generally, it requires fewer steps, and cheap raw materials. 1746-77-6, name is Isopropyl carbamate, A new synthetic method of this compound is introduced below., SDS of cas: 1746-77-6
Intermediate 4 1-Methylethyl(2E)-2-butenoylcarbamate Isopropyl carbamate (30 g, 291 mmol, available from TCI) was charged to a 3 L Lara vessel and dry THF (150 ml) added. (2E)-2-Butenoyl chloride (31.2 ml, 326 mmol, available from Aldrich) was added under nitrogen and the jacket cooled to -30 C. When the solution temperature reached -17 C. lithium tert-butoxide (1M, 655 ml, 655 mmol) was added by peristaltic pump over 2 h, keeping the reaction temperature between -10 C. and -18 C. Once the addition was complete the mixture was stirred for 30 min and brought to 0 C. Diethyl ether (450 ml) and hydrochloric acid (1M, 375 ml) were added and the mixture brought to 20 C. with vigorous stirring. The stirring was stopped, the layers allowed to separate and the aqueous layer run off. Brine (375 ml) was added and the mixture stirred vigourously. The stirring was stopped, the layers allowed to separate and the aqueous layer run off. The organic layer was dried (MgSO4), filtered and evaporated to a brown oil (60 g). The oil was applied to a silica column (40+M Biotage) and eluted with DCM/ethyl acetate (1:1 to 0:1, 10 CV). The product containing fractions were evaporated to dryness and loaded on to a silica column (1500 g, Redisep Isco) and eluted with a ethyl acetate in cyclohexane gradient (0-40%). The clean, product containing fractions were evaporated to an off-white solid (15.41 g). LCMS (Method C), Rt 0.68, MH+172
The basis of chemical reaction formula synthesis, the synthesis route is composed of some specific reactions and combined according to certain logical thinking. We look forward to the emergence of more reaction modes in the future.
Reference:
Patent; GlaxoSmithkline LLC; Amans, Dominique; Demont, Emmanuel Hubert; Jones, Katherine Louise; Seal, Jonathan Thomas; Walker, Ann Louise; US2014/66459; (2014); A1;,
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