A triazole compound having the formula: ##STR1## wherein Ar.sup.1 represents an optionally substituted phenyl, Ar.sup.2 represents an optionally substituted phenyl, R.sup.0 represents a hydrogen atom or a lower alkyl; R.sup.1 represents a lower alkyl; R.sup.2 to R.sup.5 represent a hydrogen atom or an unsubstituted or halo substituted alkyl, n represents 0 to 2; p represents 0 or 1; q, r and s each represent 0 to 2; and A represents a 1,3-dioxan-5-yl. The triazole compound of the present invention exhibits an excellent antifungal activity.
A chiral variant of B(C6F5)3 with a 3,3′‐disubstituted binaphthyl backbone is shown to catalyze Nazarov cyclizations with high levels of enantio‐ and diastereocontrol. The parent B(C6F5)3 also promotes these ring closures efficiently. This electrocyclization is another example of the still small family of C−C bond formations mediated by B(C6F5)3 as the catalyst.
具有3,3'-双取代的联萘骨架的B(C 6 F 5)3的手性变异体可催化Nazarov环化反应,并具有高水平的对映和非对映控制。母体B(C 6 F 5)3也有效地促进了这些环的闭合。这种电环化是由B(C 6 F 5)3作为催化剂介导的C-C键形成家族仍然很小的另一个例子。
Copper-Catalyzed Tandem Hydrocupration and Diastereo- and Enantioselective Borylalkyl Addition to Aldehydes
作者:Won Jun Jang、Jaesook Yun
DOI:10.1002/anie.201806937
日期:2018.9.10
report the copper‐catalyzed stereoselective addition of in situ generated chiral boron‐α‐alkyl intermediates to various aldehydes including α,β‐unsaturated aldehydes under mild conditions. This tandem and multicomponent method facilitated the synthesis of enantiomerically enriched 1,2‐hydroxyboronates bearing contiguous stereocenters in good yield with high diastereo‐ and enantioselectivity up to a ratio
Electrophilic Phosphonium Cations as Lewis Acid Catalysts in Diels–Alder Reactions and Nazarov Cyclizations
作者:Maria Vogler、Lars Süsse、James H. W. LaFortune、Douglas W. Stephan、Martin Oestreich
DOI:10.1021/acs.organomet.8b00496
日期:2018.10.8
[(C6F5)3PF]+[B(C6F5)4]− is shown to catalyze Diels–Alderreactions of challenging dienophile/enophile combinations and Nazarov cyclizations of various precursors. Several other electrophilic phosphonium cations (EPCs) have been tested for comparison. This systematic study demonstrates the power of these Lewis acids to act as catalysts for synthetically useful pericyclic reactions.
高亲电性的氟阳离子[(C 6 F 5)3 PF] + [B(C 6 F 5)4 ] -已显示出催化Diels-Alder反应的挑战,挑战了亲二烯体/亲烯体的组合以及各种前体的纳扎罗夫环化。已测试了其他几种亲电phospho阳离子(EPC)进行比较。这项系统的研究证明了这些路易斯酸作为合成上有用的周环反应的催化剂的能力。