Acetamide → 1,2,3,4-Tetrahydroisoquinoline

Participants

Reaction Steps

Primary amine from example 1 (200 mg) was reacted with acetyl chloride (1.3 eq.) in dry ethylamine (3 eq.) and dry dichloromethane (5 ml) at 0° C. for 1 hour, then 25° C. for 14 hours and gave the acetamide in 88% yield. The acetamide (103 mg, 0.263 mmol) was refluxed for 3 hours with POCl3 (7.5 eq.) in dry toluene (10 ml) at 110° C. for 14 hours followed by NaBH4 reduction (11 eq.) in dry ethanol gave the corresponding 1,2,3,4-tetrahydroisoquinoline (50 mg, 51%). Demethylation as in example 1 gave the expected product as the hydrobromide salt (50 mg, 87%).

Provenance & Evidence