Coupling of alkynyl organometallics with 4-acetoxy-1,3-dioxanes: Synthesis of propargylic and allylic anti-1,3-diols
摘要:
Alkynyl diethylalanes and stannanes couple with 4-acetoxy-1,3-dioxane 1 in the presence of BF3 . OEt2 to give acetal protected propargylic anti-1,3-diols 2 in high yield, with exquisite diastereoselectivity and little acetal epimerization. These propargylic dioxanes 2 are useful intermediates for further diastereoselective reactions. (C) 1998 Elsevier Science Ltd. All rights reserved.
Coupling of alkynyl organometallics with 4-acetoxy-1,3-dioxanes: Synthesis of propargylic and allylic anti-1,3-diols
摘要:
Alkynyl diethylalanes and stannanes couple with 4-acetoxy-1,3-dioxane 1 in the presence of BF3 . OEt2 to give acetal protected propargylic anti-1,3-diols 2 in high yield, with exquisite diastereoselectivity and little acetal epimerization. These propargylic dioxanes 2 are useful intermediates for further diastereoselective reactions. (C) 1998 Elsevier Science Ltd. All rights reserved.