反应详情

Iodouridine 21 was coupled for 3 hours to N-propargyltrifluoroacetamide following the general method given in Example 5C. Chromatography with a 0-5% methanol in dichloromethane gradient afforded material which was homogeneous by TLC, but which was difficult to dry. After co-evaporating the chromatographed product several times with chloroform and vacuum-drying, 536.5 mg of alkynylamino nucleoside 22 was obtained as a white foam. This material was homogeneous by TLC and was pure by NMR except for a small amount (39 mole %; corrected yield 66%) of chloroform.

1. customto dry
2. customvacuum-drying