منابع مشابه
Ugi Multicomponent Reaction Based Synthesis of Medium-Sized Rings
An Ugi multicomponent reaction based two-step strategy was applied to generate medium-sized rings. In the first linear expansion phase, a series of diamines reacted with cyclic anhydrides to produce different lengths of terminal synthetic amino acids as the starting material for the second phase. The Ugi-4-center 3-component reaction was utilized to construct complex medium-sized rings (8-11) b...
متن کاملA platinum-catalyzed annulation reaction leading to medium-sized rings.
A platinum-catalyzed domino process with intermediate benzopyrylium cations reaches its optimum utility in the formation of 7- and 8-membered rings. With iron(III) chloride, a tetracyclic product is isolated, derived from an oxidative transformation of a metal-carbene intermediate.
متن کاملAnnulation Reactions of Allenyl Esters: An Approach to Bicyclic Diones and Medium-Sized Rings
A flexible approach to construct sterically congested bicyclo-alkenedione frameworks is reported. Under the action of potassium carbonate, α-sulphonyl cycloalkanones are added to functionalized allenyl esters, leading to a lactone intermediate that is subsequently reduced to initiate an intramolecular aldol cyclization to [3.2.1], [3.3.1], and [4.3.1] bicycles. Oxidation then affords bicyclic d...
متن کاملAsymmetric synthesis of medium-sized rings by intramolecular Au(I)-catalyzed cyclopropanation.
An efficient method for the asymmetric gold(I)-catalyzed preparation of medium sized rings has been developed. The method provides 7- to 9-membered rings in excellent yield. High enantioselectivities can be achieved for 7- and 8-membered ring products employing chiral gold(I) complexes. The results provide insight into the mechanism, showing the fluxional nature of gold(I)-stabilized vinyl carb...
متن کاملOrganizational Structure Design of Medium-Sized Municipalities in Iran Performance
Nowadays communications, decision-making, reporting manner and hierarchy are controlled by organizational structure getting an inside into such structure means getting an insight over the whole organization. It serves as a platform for operation of plans and strategies and also determines links among personnel or executive body of the organization. In line with developments in other elements, o...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Journal of Synthetic Organic Chemistry, Japan
سال: 1972
ISSN: 0037-9980,1883-6526
DOI: 10.5059/yukigoseikyokaishi.30.109