The friedel-crafts reaction of acid chlorides with ethene ; Di-addition and molecular rearrangement
作者:Francis X Bates、John A Donnelly、John R Keegan
DOI:10.1016/s0040-4020(01)80962-5
日期:1991.1
Acid chlorides, complexed with excess aluminiumchloride, reacted with ethene to form 3-methyl-2-buten-1-ones, i.e. rearranged di-addition products having a terminal isoprenoid skeleton, together with the usual β-chloropropanones. The latter were the sole products in the absence of excess catalyst. Acid chlorides containing a suitably situated π-system underwent intramolecular cyclization, e.g. 2-
Oxidative rearrangement of 2-alkoxy-3,4-dihydro-2H-pyrans: stereocontrolled synthesis of 4,5-cis-disubstituted tetrahydrofuranones including whisky and cognac lactones and crobarbatic acid
Oxidation of 2-alkoxy-3,4-dihydro-2H-pyrans 3 with dimethyldioxirane or MTO/urea–H2O2 followed by Jones oxidation leads to rearrangement and stereocontrolled formation of 4,5-cis-disubstituted tetrahydrofuranones. The method is applied to the synthesis of the whisky lactone 9, cognac lactone 10 and crobarbatic acid 17.
用二甲基二环氧乙烷或MTO /脲-H 2 O 2氧化2-烷氧基-3,4-二氢-2 H-吡喃3,然后进行琼斯氧化,导致4,5-顺式-二取代的四氢呋喃酮的重排和立体形成。该方法适用于威士忌内酯9,白兰地内酯10和巴巴果酸17的合成。
Utilization of Donor-Acceptor Interactions for the Catalytic Acceleration of Nucleophilic Additions to Aromatic Carbonyl Compounds
electrophilic activation of aromatic carbonyl substrates, by utilizing donor–acceptor interactions between an electron‐deficient macrocyclic boronic ester host ([2+2]BTH‐F) and an aromatic carbonyl guest substrate, was realized. In the presence of a catalytic amount of [2+2]BTH‐F, dramatic acceleration of the nucleophilic addition of a ketene silyl acetal towards either electron‐rich aromatic aldehydes or ketones
Adrenoceptor blocking agents. 2. 2-(.alpha.-Hydroxyarylmethyl)-3,3-dimethylaziridines, a new class of selective .beta.2-adrenoceptor antagonists
作者:Padam C. Jain、Y. Khandelwal、Onkar N. Tripathi
DOI:10.1021/jm00199a012
日期:1978.1
threo-2-[alpha-hydroxy(2-naphthyl)methyl]- and 2-[alpha-hydroxy(3,4-dichlorobenzyl)]-3,3-dimethylaziridines (1d and 1c) have been prepared as conformationally restricted analogues of beta-adrenoceptor blockingagents like dichloroisoproterenol (DCI) and pronethalol. The aziridine analogues 1 except possibly 1c are competitive antagonists of isoproterenol-induced response on a guinea pig tracheal chain preparation