A Quick Procedure for the Preparation of 1-N,N-Dialkylamino-1-Buten-3-Ynes
摘要:
1-N,N-Dialkylamino-1-buten-3-ynes, HC = CCH = CHNR2 (R = CH3 or C2H5, E/Z ratio approximately 97:3) have been prepared in 80 and 84% yields by treating the Mannich-coupling products from HC = CCH2OCH3 and R2NCH2OH, CH3OCH2C = CCH2NR2, with two equivalents of potassium amide in liquid ammonia and subsequently adding methanol or ammonium chloride.