Multigram Synthesis of Advanced 6,6-Difluorospiro[3.3]heptane-derived Building Blocks.

Multigram Synthesis of Advanced 6,6-Difluorospiro[3.3]heptane-derived Building Blocks.
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DOI:
10.1002/ejoc.202000432
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发表时间:
2021-12-21
影响因子:
2.8
通讯作者:
Radchenko DS
Radchenko DS
中科院分区:
化学3区
文献类型:
--
作者:
Olifir OS;Chernykh AV;Dobrydnev AV;Grygorenko OO;Moroz YS;Voitenko ZV;Radchenko DS

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A convenient methodology for constructing 6,6-difluorospiro[3.3]heptane scaffold – a conformationally restricted isostere of gem-difluorocycloalkanes – is developed. Alarge array of novel 2-mono- and 2,2-bifunctionalized difluorospiro[3.3]heptane building blocks was obtained through the convergent synthesis strategy using a common synthetic precursor – 1,1-bis(bromomethyl)-3,3-difluorocyclobutane. The target compounds and intermediates were prepared by short reaction sequences (6–10 steps) on multigram scale (up to 0.47 kg). Spiro compounds An approach to 6,6-difluorospiro[3.3]heptane scaffold – a conformationally restricted isostere of gem-difluorocycloalkanes – is developed. A large array of novel 2-mono- and 2,2-difunctionalized 6,6-difluorospiro[3.3]heptane building blocks was obtained in multigram scale through the convergent synthesis strategy using a common synthetic intermediate – 1,1-bis(bromomethyl)-3,3-difluorocyclobutane.
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