Planarization of tetracoordinate carbon. Approach toward the synthesis of “tetraquinacane”—II
作者:H. Schori、B.B. Patil、R. Keese
DOI:10.1016/0040-4020(81)80013-0
日期:1981.1
Dicyclopentadiene is introduced as a useful starting material for the preparation of 2-exo-8-endo- disubstituted derivatives of bicyclo[3.3.0]octane.
引入双环戊二烯作为有用的原料,用于制备双环[3.3.0]辛烷的2-exo-8-内二取代衍生物。
A conceptually new route to optically active carba-prostacyclins: synthesis of exocyclic alkenes via doubly lithiated allyl sulfones
作者:Hans-Joachim Gais、Walter A. Ball、Jörg Bund
DOI:10.1016/s0040-4039(00)80208-7
日期:1988.1
substitution provides a novel synthon for 1.1-dilithioalkenes. Starting from the enantiomerically pure dimesylate 5b and using 6 a conceptually new route to optically active carbaprostacyclins 2 via the bicyclic allylsulfones 2S/2R-7 and their substitution with the cuprate 8 to the alkenes E/Z-9 has been realized. Substitution of 11 with 2-3 equiv RLi proceeds via the o-lithioaryl sulfone 14 to yield rac-13
Kinetic and Thermodynamic Control in the Synthesis of Tetrahydro-Pyrans and -Furans from 1,4-Diols by Stereospecific Phenylsulfanyl (PhS) Migration: Competition Between <i>exo</i> and <i>endo</i> Transition States and between [1,2] and [1,4]Sulfanyl Participation
作者:Jason Eames、Nikolai Kuhnert、Francis H. Sansbury、Stuart Warren
DOI:10.1055/s-1999-2814
日期:1999.8
The factors controlling the cyclisation of 1,4-diols with PhS migration to give THPs rather than THFs are reassessed. Furthermore we provide evidence for a competition between [1,2] and [1,4] sulfanyl participation and cyclisation onto a five membered cyclic sulfonium salt.
Planarisierung von tetrakoordiniertem Kohlenstoffatom. Synthese des überbrückten all-<i>cis</i>-[5.5.5.5]Fenestrans 13-Oxapentacyclo[5.5.2.1<sup>1.7</sup>.0<sup>4,15</sup>.0<sup>10,15</sup>] pentadecan-14-on
作者:Armin Pfenninger、Alex Roesle、Reinhart Keese
DOI:10.1002/hlca.19850680223
日期:1985.3.27
Planarisation of Tetracoordinate Carbon Atom, Synthesis of the Brigded all-cis-[5.5.5.5]Fenestrane 13-Oxapentacyclo[5.5.2.11,7.04,15.010,15]pentadecan-14-one
Compounds of formula I ##STR1## and pharmaceutically acceptable salts thereof; in which R.sub.1 and R.sub.2, which are the same or different, are H or an optionally substituted hydrocarbon group or R.sub.1 and R.sub.2 together with the nitrogen atom to which they are attached form an optionally substituted heterocyclic ring; R.sub.3 is an optionally substituted aromatic hydrocarbon group; and R.sub.4 is a hydrocarbon group containing at least one substituent selected from the group consisting of hydroxy and acylated derivatives thereof, optionally substituted alkoxy groups, optionally substituted cycloalkyloxy groups, optionally substituted alkylenedioxy groups, oxo and groups of formula S(O).sub.p R.sub.5 in which p is 0, 1 or 2 and R.sub.5 is an alkyl group, said hydrocarbon group being optionally substituted by additional substituents, are useful in the treatment of depression.