Connective Synthesis of Polysubstituted Tetrahydropyrans by a Novel and Stereocontrolled Metallo-ene/Intramolecular Sakurai Cyclization Sequence
摘要:
A novel methodology based upon the allylmetalation step followed by an Intramolecular Sakurai Cyclization (IMSC) provides an efficient access to a variety of tetrahydropyran derivatives. This new strategy nicely complements our initial protocol that embodied a tandem ene reaction/IMSC sequence. Both mono- and dihydroxy-tetrahydropyrans could be easily assembled with complete stereocontrol at the various chiral centers.
The present invention provides derivatives of thiazolylamino-substituted heterocycles. These compounds are inhibitors of kinases, including compounds that show antiproliferative activity against cells, including against tumor cells, and are useful in the treatment of diseases including cancer.
Base-catalyzed Dehydrobromination of Several α-Bromoacetals
作者:H. A. Davis、R. K. Brown
DOI:10.1139/v71-375
日期:1971.7.1
conditions convert the acetals obtained from homologues of α-bromoacetaldehyde and monohydroxy alcohols, to the α,β-unsaturated acetals, in some cases exclusively, and in others as the major product accompanied by a smaller proportion of the corresponding ketene acetal.The preference for the keteneacetal formation from the 2-(α-bromoalkyl)-1,3-dioxolanes (the ethyleneacetals) is believed due to greater
Tandem Ene-Reaction/Intramolecular Sakurai Cyclisation (IMSC): A Novel Access to Polysubstituted Tetrahydropyrans and γ-Butyrolactones Using a Unique Allylation Strategy
作者:István E. Markó、Raphaël Dumeunier、Cédric Leclercq、Bernard Leroy、Jean-Marc Plancher、Abdelaziz Mekhalfia、Daniel J. Bayston
DOI:10.1055/s-2002-28506
日期:——
The ene-reaction between a variety of aldehydes and allylsilane 22 generates highly functionalised homoallylic alcohols 23. These adducts undergo a subsequent Intramolecular Sakurai Cyclisation (IMSC), affording in good yields polysubstituted tetrahydropyran derivatives. Furthermore, oxidative desilylation of 23 provides an efficient, connective access to a range of γ-butyrolactones and α-methylene-γ-butyrolactones.
Concise and stereocontrolled synthesis of polysubstituted tetrahydropyrans
作者:István E Markó、Bernard Leroy
DOI:10.1016/s0040-4039(00)01179-5
日期:2000.9
A range of polysubstituted tetrahydropyrans can be readily assembled by a novel methodology involving a metallo-ene reaction coupled with an intramolecular Sakurai cyclisation (IMSC)
Catalytic Diastereoselective Hetero-Diels–Alder Reaction of α-Haloacroleins with Alkenes: Construction of 3,4-Dihydropyran
作者:Lei Zeng、Qian Lei、Weidong Rao、Lizhu Gao
DOI:10.1021/acs.orglett.2c00341
日期:2022.3.25
In this Letter, a catalyticdiastereoselective hetero-Diels–Alder reaction of α-haloacroleins with less polarized alkenes was developed, and the resulting 3,4-dihydropyrans were produced in high yields with a broad substate scope. Mechanism studies showed that 3,4-dihydropyran was produced from the ring expansion of cyclobutane, which was generated in the ring contraction of the initially formed unstable