synthesis of a new heterocycle, 1-phenyl-phosphapyracene (Ph-4, Ph-PyraPhos), by tandem phosphination/cyclization of peri-substituted 5-bromo-6-chloromethylacenaphthene (3) was investigated for comparison to Pt-catalyzed formation of 1-phosphaacenaphthenes (2, AcePhos) from the analogous naphthalene precursor (1). Reaction of PH2Ph with 3, NaOSiMe3 and a Cu catalyst gave Ph-4; a Pt catalyst yielded PHPh(CH2Ar)
新的杂环,1-苯基phOSphapyracene(
金属-介导的合成PH-4,PH-PyraPhOS),通过串联phOSphination /环化围取代5-
溴-6- chloromethylacenaphthene(3)进行了研究,用于比较
铂-从类似的
萘前体(1)催化形成1-
磷ac烷(2,AcePhOS )。PH 2 Ph与3,NaOSiMe 3和Cu催化剂的反应得到Ph-4 ; 用Pt催化剂得到
PHPh(CH 2 Ar)(Ph-11,Ar = 5-Br-ena基)。该二级膦的复合物[Pt((R,R)-Me-DuPhOS)(Ph)(
PHPh(CH 2 Ar))] [PF 6 ](17),生成
磷中间体Pt((R,R)-Me-DuPhOS)(Ph)(PPhCH 2 Ar )(Ph-8),其环化得到[Pt((R,R)-Me-DuPhOS)(Ph)(Ph-PyraPhOS)] [PF 6 ](18)