Ring Expansion of 1-Indanones to 2-Halo-1-naphthols as an Entry Point to Gilvocarcin Natural Products
作者:Ivica Zamarija、Benjamin J. Marsh、Thomas Magauer
DOI:10.1021/acs.orglett.1c03530
日期:2021.12.3
functional group tolerance, benefits from mild reaction conditions, and enables rapid access to the tetracyclic core of gilvocarcin natural products. The orthogonally functionalized products allow for selective postmodifications as exemplified in the totalsynthesis of defucogilvocarcinM. For the selective oxidation of the chromene, a mild and regioselective oxidation protocol (DDQ and TBHP) was developed
在此,我们描述了 1-茚满酮的两步环扩展以提供 2-氯/溴-1-萘酚(32 个例子)。所开发的方法显示出广泛的官能团耐受性,受益于温和的反应条件,并且能够快速获得吉沃卡星天然产物的四环核心。正交功能化的产品允许选择性后修饰,如 defucogilvocarcin M 的全合成所示。为了选择性氧化色烯,开发了温和的区域选择性氧化方案(DDQ 和 TBHP)。
A xanthate-based free radical approach to defucogilvocarcin M
A formal totalsynthesis of the aglycon of gilvocarcinM is described. The synthesis is based on the construction of the key naphthalene 7 via a free radical addition–cyclization protocol followed by aromatization of the resulting α-tetralone. This highly functionalized aromatic system is coupled to the corresponding acid chloride 6 to afford ester 4, which by treatment with a catalytic amount of palladium
An efficient synthetic method for versatile dibenzoxaborins based on boron-selective Suzuki-Miyaura cross-coupling between o-borylphenols and aryl halides or triflates bearing a 1,8-diaminonaphthalene-protected o-boryl group is reported. A short synthesis of defucogilvocarcin M was achieved using the proposed method in combination with several other boron-mediated transformations.
Concise Three-Component Synthesis of Defucogilvocarcin M