Indole lactones 8 and 14 were synthesized as a means of functionalizing the 1-isopropyl substituent of the indole nucleus. Lactone 8, upon reduction with diisobutylaluminum hydride, produces lactol 9 which behaves like a masked hydroxy aldehyde and undergoes a Horner-Emmons reaction with triethyl phosphonoacteate to give α,β-unsaturated ester 3 which possesses a hydroxyl group on the 1-isopropyl moiety
合成
吲哚内酯8和14作为官能化
吲哚核的1-异丙基取代基的手段。内酯8经
二异丁基氢化铝还原后,生成内酯9,其行为类似于被掩盖的羟基醛,并与
膦酸乳酸三乙酯进行Horner-Emmons反应,得到在1-异丙基部分具有羟基的α,β-不饱和酯3。