Synthesis of novel sulfide-based cyclic peptidomimetic analogues to solonamides
作者:José Brango-Vanegas、Luan A Martinho、Lucinda J Bessa、Andreanne G Vasconcelos、Alexandra Plácido、Alex L Pereira、José R S A Leite、Angelo H L Machado
DOI:10.3762/bjoc.15.247
日期:——
Eight new sulfide-based cyclic peptidomimetic analogues of solonamides A and B have been synthesized via solid-phase peptide synthesis and SN2’ reaction on a Morita–Baylis–Hillman (MBH) residue introduced at the N-terminal of a tetrapeptide. This last step takes advantage of the electrophilic feature of the MBH residue and represents a new cyclization strategy occurring. The analogues were prepared
通过固相肽合成和在四肽N端引入的Morita-Baylis-Hillman(MBH)残基上进行固相肽合成和S N 2'反应,已经合成了8种新的基于磺化物的环酰胺A和B环状拟肽类似物。最后一步利用了MBH残基的亲电子特性,代表了正在发生的新环化策略。这些类似物以中等的总产量制备,对金黄色葡萄球菌的生长没有毒性作用,对人成纤维细胞没有毒性。它们中的两个抑制金黄色葡萄球菌的溶血活性,表明在细菌群体感应中的干扰作用类似于已经报道的对磺胺类药物的干扰作用。
POLYMERIZABLE POLAR COMPOUND, LIQUID CRYSTAL COMPOSITION AND LIQUID CRYSTAL DISPLAY ELEMENT
申请人:JNC CORPORATION
公开号:US20200002613A1
公开(公告)日:2020-01-02
A compound represented by Formula (1):
R
1
is hydrogen or an alkyl group that may be substituted; rings A
1
to A
2
are cyclohexylene or phenylene that may be substituted; a is 0 to 4; Z
1
is a single bond or an alkylene group that may be substituted; Sp
1
to Sp
3
are a single bond or an alkylene that may be substituted; M
1
to M
4
are H, F, Cl, or an alkyl group that may be substituted; R
2
and R
3
are hydrogen, a group represented by Formula (1-a), or an alkyl group having 1 to 5 carbon atoms that may be substituted; and at least one of R
2
and R
3
is a group represented by Formula (1-a);
Sp
4
is a single bond or an alkylene group that may be substituted; R
4
and R
5
are hydrogen or an alkyl group; and at least one of R
4
and R
5
is an alkyl group.
Conjugated enals or their methyl acetals react with benzeneselenenyl chloride in the presence of an oxygen nucleophile to give Michael-type adducts. The latter are oxidized into 2-alkylidene 3-oxy propanals and propionic acids.
Rh(III)-Catalyzed Acceptorless Dehydrogenative Coupling of (Hetero)arenes with 2-Carboxyl Allylic Alcohols
作者:Jintao Xia、Zhipeng Huang、Xukai Zhou、Xifa Yang、Feng Wang、Xingwei Li
DOI:10.1021/acs.orglett.7b03881
日期:2018.2.2
Rhodium(III)-catalyzed C–H activation of (hetero)arenes and redox-neutral coupling with 2-carboxyl allylic alcohols has been realized for the construction of β-aryl ketones. This reaction occurred efficiently at a relatively low catalyst loading via initialdehydrogenative alkylation to give a β-keto carboxylic acid, followed by decarboxylation.
The capability of platinum, palladium and ruthenium sulfophthalocyanines (PtPcS, PdPcS and RuPcS) to act as singletoxygen [1O2(1Δg)] photosensitizers in enereactions in aqueous medium has been investigated by combining time-resolved and steady-state techniques. Laser flash photolysis experiments with nanosecond time resolution revealed the population of the lowest excited triplet state in the case