Bifunctional phosphonium/thioureas derived from tert-leucine behaved as highly selective catalysts for enantioselective protonation of enol esters, providing α-chiral ketones in yields of up to 99% with high enantioselectivities (up to 98.5:1.5 er). Control experiments clarified that a bulky tert-butyl group and phosphonium and thiourea moieties were necessary to achieve such high stereoselectivity
high-density jet fuel range tricyclic alkanes with methyl benzaldehydes and cyclohexanone which can be derived from lignocellulose. In the first step, C14 oxygenates (i.e. 2-(2-methylbenzylidene)cyclohexanone or 2-(4-methylbenzylidene)cyclohexanone) were obtained by the solvent-free aldol condensation of 2-methyl benzaldehyde (or 4-methyl benzaldehyde) and cyclohexanone. Among the investigated catalysts
开发了一种新的两步法,用于合成可以由木质纤维素衍生的甲基苯甲醛和环己酮的高密度喷气燃料系列三环烷烃。在第一步中,通过无溶剂的2-甲基苯甲醛(或4-甲基苯甲醛)和(甲基)苯甲醛缩合得到C 14含氧化合物(即2-(2-甲基苄叉基)环己酮或2-(4-甲基苄叉基)环己酮)。环己酮。在所研究的催化剂中,EAOAc离子液体(用乙醇胺和乙酸制备的可再生催化剂)显示出最高的活性和良好的稳定性。其上的C 14的高碳收率(〜85%)在温和的反应条件下(353 K,6 h)获得含氧化合物。在第二步骤中,通过在商业Pd / C催化剂上进行水相加氢脱氧(APHDO),将C 14含氧化合物选择性地转化为1-甲基十二碳氢-1 H-芴和3-甲基十二碳氢-1 H-芴。根据我们的测量,所获得的1-甲基十二烷基-1 H-芴和3-甲基十二烷基-1 H-芴具有高密度(在298 K下分别为0.99 g mL -1和0.96 g mL
NOVEL TRICYCLIC COMPOUNDS USEFUL FOR THE TREATMENT OF INFLAMMATORY AND ALLERGIC DISORDERS: PROCESS FOR THEIR PREPARATION AND PHARMACEUTICAL COMPOSITIONS CONTAINING THEM
申请人:Balasubramanian Gopalan
公开号:US20080146810A1
公开(公告)日:2008-06-19
The present invention relates to novel tricyclic compounds useful for the treatment of inflammatory conditions, diseases of the central nervous and insulin resistant diabetes.
本发明涉及新型三环化合物,可用于治疗炎症病症、中枢神经疾病和胰岛素抵抗性糖尿病。
[EN] COMPOUND HAVING CHIRAL SPIROBIINDANE SKELETON AND PREPARATION METHOD THEREFOR<br/>[FR] COMPOSÉ PRÉSENTANT UN SQUELETTE SPIROBIINDANE CHIRAL ET SON PROCÉDÉ DE PRÉPARATION<br/>[ZH] 手性螺二氢茚骨架化合物及其制备方法