Intramolecular [4+3] Cycloadditions. Towards a Synthesis of Widdrol
摘要:
Certain substituted alkoxyallylic sulfones were alkylated and treated with Lewis acids to produce vinylthionium ions that underwent intramolecular [4+3] cycloaddition reactions with a tethered furan. Manipulation of the cycloadduct led to the synthesis of widdrol. Other attempts to prepare the cycloadducts were made, but none were exceptionally better than the route using vinylthionium ions as intermediates. Interesting aspects of the alkylation chemistry of phenylthio-substituted alkoxyallylic sulfones are detailed as well.
or hydrogen with inversion of the absolute configuration via the two-step sequence consists of Grignard reaction or reduction of the carbonyl followed by pinacol-type rearrangement. This transformation was applied to the total synthesis of the [6-7] fused-ring sesquiterpene widdrol ((±)-9). The stereochemistry of the tertiary alcohol of 9 was specifically controlled by employing a bridge-cleaving method
A TOTAL SYNTHESIS OF (±)-WIDDROL. SYNTHETIC APPLICATION OF THE FORMAL BRIDGEHEAD SUBSTITUTION OF 1-METHOXYBICYCLO[3.2.2]NON-6-EN-2-ONES WITH ALKYL GROUPS
The [6–7] fused-ring sesquiterpene (±)-widdrol has been prepared stereospecifically utilizing the characteristic reactions of the bridged polycyclic compounds derived from 1-methoxy-5-methylbicyclo[3.2.2]non-6-en-2-one.
Control of remote relative chiralities: a stereospecific total synthesis of dl-widdrol
作者:Samuel Danishefsky、Kazuo Tsuzuki
DOI:10.1021/ja00542a059
日期:1980.10
Intramolecular [4+3] Cycloadditions. Towards a Synthesis of Widdrol
作者:Michael Harmata、Mehmet Kahraman、Gilbert Adenu、Charles L. Barnes
DOI:10.3987/com-03-s(p)53
日期:——
Certain substituted alkoxyallylic sulfones were alkylated and treated with Lewis acids to produce vinylthionium ions that underwent intramolecular [4+3] cycloaddition reactions with a tethered furan. Manipulation of the cycloadduct led to the synthesis of widdrol. Other attempts to prepare the cycloadducts were made, but none were exceptionally better than the route using vinylthionium ions as intermediates. Interesting aspects of the alkylation chemistry of phenylthio-substituted alkoxyallylic sulfones are detailed as well.
신규 세스퀴테르펜 유도체 (3) 및 이의 용도
申请人:MFC Co.,Ltd. 엠에프씨 주식회사(120080171659) Corp. No ▼ 131411-0209249BRN ▼134-86-46389
公开号:KR20210055172A
公开(公告)日:2021-05-17
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