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KarryOn 03/31/2020 20:20
There have been mixed reports on what life is like inside mandatory hotel quarantine for returning international travellers. Today, we’re bringing you a firsthand experience from travel bloggers Darren and May Sutton, the duo behind Destination Hunters. The pair recently arrived on an international flight to Brisbane before being quarantined at the Rydges Hotel in […]. .
Abstract. Isochroman scaffold constitutes an important structural unit, which is present in various bioactive natural products and synthetic pharmaceutical compounds exhibiting wide arrays of biological properties. Hence the synthesis of this class of heterocyclic compounds in stereoselective fashion is highly significant and desirable. In the last decade, a substantial advancement has been witnessed for the catalytic asymmetric synthesis of ischroman derivatives employing metal‐catalysts bearing chiral ligands or chiral metal‐free organocatalysts. This review aims to provide an overview of the transition metal‐ and organo‐catalyzed asymmetric synthesis of isochroman derivatives including isochromenes and isochromanones.
A synergistic rhodium‐ and Brønsted acid‐ catalyzed reaction of quinone imine ketals with diazo compounds to access multi‐substituted anilines is presented here. This reaction takes place through a process involving C‐O bond cleavage, modification of the leaving alcoholic fragment, and selective reassembly of the reactive fragments. Moderate enantioselectivities are achieved when a chiral 1,1’‐bi(2‐naphthol)‐based phosphoric acid is used.
A versatile method for the Suzuki–Miyaura cross‐coupling of amides using highly active, well‐defined, and air‐stable Pd–phosphine precatalysts is reported. Most notably, the method represents the first example of using practical and operationally‐simple Pd(II)–phosphine precatalysts in the emerging amide bond cross‐coupling manifold. The reactions are efficient at 0.10 mol% loading, furnishing biaryl ketones with high chemoselectivity for N– C(O) bond cleavage. This versatile method enables for the first time to achieve Pd–phosphine‐catalyzed cross‐ coupling of amides at ppm loading. This C–N cross‐coupling can be used to efficiently furnish pharmaceutical intermediates by orthogonal Pd‐catalyzed cross‐couplings. We fully expect that operat.


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